Illuminating device for projecting purposes



S. E. DOANE, R. P. BURROWS AND A. F. SINCLAIR.

ILLUMINATING DEVICE on PROJECHNG PURPOSES.

Rissued Feb. 17, 1920 APPLICATION mm JAN 21. as

APPUCATIOI FILED 0C1; 25, I919.

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ILLUMINATING DEVICE FOR PROIECT lNG PURPOSES. ROIBSHOd Feb. 17, 1920.APPLICATION men JAN. 2| I9l6. -APPLICATION FILED OCT. 25. 1919.

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S. E. DUANE; R. P.-BURROWS AND A. F. L-INCLAIR.

mummnms DEVICE FOR momma vun o'scs. 1920..

APPLICATION FILED OCT. 25. I9I9.

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PATENT OFFICE.

SAMUEL EVERETT DOANE, ROBERT P..BURROWS. AND ARCHIBALD F. SINCLAIR, OP-CLEVELAND, OHIO, ASSIGNORS TO GENERAL ELECTRIC COMPANY. A CORPORATION 01NEW YORK.

ILLUMINATING DEVICE FOR PBOJECTING PURPOSES.

14,805. ori ami No. 1,315,321. dated I ()hio. have invented certain'newand useful shifting the lamp housing ll])t)ll ill( failure. of the lampin immediate use. As applied Improvements in Illuminating Devices forProjecting Purposes. of which the following is a specification.

()ur invention relates to illuminating de- \ices constituting parts ofpicture projection apparatus, and more particularly to housingsincluding the supports for the light projecting elements. such as thelight; source. reflector and condenser. which are ortlinzirilv includedin such devices. In the specification we have used the expression lamplions ing" to indicate the apparatus comprised h our invention. ()urlamp housing particularly adapted to the use of an electric.im-andescent lamp as the light source. The ohjeet of our invention is toprovide a device of this character which will permit oi the quickreplacement of lamps when net-es sar aml which will also permit a readyand accurate adjustment of the light .projecting elements.

According to our invention. we provide within the lamp housing supportstor a plui'alit v ot' incandescent lamps aml means \\'he.reh one lampmay be readily substituted for another in operative relation to the restof the picture projecting apparatus. In its pi'el'errial form ourinvention comprises a lamp housing having at each end thereof altincandeswent lamp and means for concentrating and directing the light.therefrom. The parts at both ends of the lamp housing are preterahlxsyininetrically disposed with reference to an axi passing through theceiitor of the lamp housing. and the lamp housing is so mounted thatitmay he rotated upon this axis to hring the parts contained at either endthereof into accurately spaced relation with the other elements of theprojection apparatus. ;\ll'll()ll; {l)*:lt' is ordinarily sullieientlyeffective to liarej the lamp housing shifted manually. toseeiire thedesired Huhstitntion of lamps. our invent ion also includes the use. ofan automatic means for section of the lamp housing.

Specification of Reissued Letters Patent. Roissuetl Feb. 17, 1920.

September 9, 1919. Serial Ila-73342. filed January 21. 1916. Applicationfor reissue filed October 25. 1919.

Serial No. 333.881.

to the aforesaid rotatahl mounted housing. the said automatic shiftingcomprises means for automatically rotating tlie housing upon the failureof the lamp which is in immediate use and means for automaticall stop)ing the said rotation when another lamp has-l. een properly substitutedfor the lamp which has failed. tages of our invention will appear fromthe detailed description of a species and modifications thereof whichfollows and from a reference to the accoin nin \'ing drawing.

In the drawin Figure l is a diagraniinatic view showing in properassembled re lation the parts of a moving pictureprojecting apparatus.Fig. 2 is a partial horizontal section of the lamp housing showing atopplan of the lower plat form and attachments forming part thereof. Fig.is a transve vertical section through the housing. Fi l is a partialvertical section on the haul-4 of Fig. 2. Fig. 5 is at longitudinalvertical partial horizontal section of thelanip housing showing the topplan of the upper platform and attachments. Fig. I a verticalsti't'lflll through the mechanism for a\\toinatirally rotating andstopping the lamp hous- .8 0

Various other features and advan- 6( Fig. (3 is i115 ingx Fig. 8 is anend elevation of the same parts. Fig. 1) is a diagram of the electriccircuits comprised in the apparatus.

.\.-; shown in Fig. l. the moving picture apparatus comprises the lamphousing 10,85

containing the illuminating portion ofthe apparatus with which ourinvention is eon eei'ned. The light projected.from the said lamp housingis directed through the lilin 11. which travels from the upper reel 12and the lower i'eel l -l through the. idlers Li and the aperture plate15., After passing through the tilin light rays pass through the ohjecthe 16. which redirects them upon the Referring now to Fig.

seieen (not shown). 5 in the drawing, it will be seen thatthe lamphousing 10 carries at; each end thereof a set ot' light projectingelements including the incandescent lamp 17. the reflector 18 and thecondenser l these elements and their relative arrangrr. ment is discosed in the am'ilieation ot' John B. Taylor. Serial No. 35,768, tiledJune 23, 1915, which is assigned to the same ussignee The Qlitlflfi?construction oi as is the present invent-ion. The incandes cent-lamp 17campriscs the coiled filament .20, which, as shown in Fig. 3 has twoparallel branches 21 lying in the same vertical plane. As disclosed inthe Taylor application above referred to, the filament 20 is so disposedwith relation to a horizontal axis passing through the center of thespherical reflector 18 and the condenser 19 that a real image of thesaid filament is reflected back to occupy a position in the same planeas the said filament but slightlyofiset so that the image of a branch ofthe coiled filament will be located between the branches 21 'of thefilament, and thus a. practically continuous area of light source isproduce The lamp l7 ,and its socket 22 are carried by a. verticallydisposed stud 23, which is .exteriorly threaded, and the lower end ofwhich extends within and engages with an. interior thread on a. bushing2-1 su ported by and extending within the gear- 7 said interior. threadbei shown in dotted lines in Fig. 2 as 26. e portion ofthe bushing 24which is within the gear-box 25 has rigidly attachedthereto andcircumferentiagily thereof a inion 27. dThis is engage by a vertica ,disse pinion 28, which is mounted upon tlre liorizontallyextending-rotatable rod 29, which is supported by thev gear-box .25, andextends transversely-of the housing. through a slot therein. other endthereof a knob 31. By turning the knob 31 the vertical position of thelamp 17 and of its filament 20 may be accurately adjusted. The gear-box25, which carries the aforesaid arts. is mounted in a transverselyextending slot 32 in a table The latter is grooved on both sides at 3%and slidably engages the extensions of a lower platforu r 35 supportednear the bottom of 'the housing. A rotatable rod 36 carries at one end apinion 37 which engages a stationary rack 38 on an extension of theplatform '35. The said rod is supported in bearings 39 on the table 33,extends through a slot 40 in the side of the housing, and has at theouter end thereof'a, knob 40. It will be apparent that by rotatingtheknob 40 the longitudinal position of the lamp and its filament may- 10accurately adjusted. The sides 41 of the gear-box 25 are perforated toemgagcwitha tliread 42 at one end of the horizontally disposedrota'ltaible rod iil'rnou'nted in bearings 44 on the table 33. The otherend of the saidrod extends through a slot I 43' and carries a knob 45.It will be apparent that by properly turnin the said knob the transverseposition 0 the lam and its filament may be accurately adjuste Theplatform 35 is secu'red'to the casing 10, as t 46. The housing as awhole is rotatably mounted upon a centrally disposed vertical shaft *7,which is stationary, being at The said carries at the tached to a tripodtable (not shown) or simi* lar support by a fastening 48. The housing isattached to a collar 49 loosely mounted on the said shaft and supportedby stationary bearing 50. The shaft 47 extends up through the casing 10and there is preferably provided at the top thereof a means for rotatingthe housing, especially when automatic means are cur loyed for bringingsuch rotating means into action upon the failure of a lamp ashercinbefore described. This rotating comprises a spiral spring 51, oneend of which is secured to the stationary shaft 47 at 52. and the otherend to a cover plate 53 loosely mounted on said shaft. The lower edge ofthe member 53 is serrated, the teeth-thereof engaging teeth on ratchet54 fast to the housing. It will be apparent that the spring 51 may bewound up by turning the member 53 and that upon the release of a stopwhich normally holds the housing in position the said housing will.

be rotated. The stop used in the form equipped with the automaticattai'rhment hcrcinbefore referred to is shown in Figs. 3, 7 and 8 andcomprise slidable pin 55 and.

spring pressed slidable grips 55.

The platform 35. as shown particularly in Figs. 2 and 4, carries at thernidd'leportion thereof and on each side pairs of U-shaped contacts 56and 57 suitably separated there i from by insulations 58 and 59respectively The ccntm'lshaft 47 has a collar-"60 rigi' y attachedthereto which supports pairs of stationary knife-blade contacts 61 and62,

insulation 63 separating the same from. the said collar. The pair ofcontacts 56 and 57 j are each connected to a socket for one of. the

incandescent lamps by suitable leads .(not shown). Each pair of thestationary contacts (i1 and 62 is connected to the energy lar in shapeto the platform 35 and is providcd at each end with extensions receivingthe table 65, the sides of which are grooved at 66, and which slidablyengage with the platform extension'at that end. The table 65 istransversely slotted at 67. A holder 68 is slidably supported by thetable in the said slot, the said holder being vertically recessed toreceive the extension rod 69 attached to the reflector 18. A set screw70 cngagcs with thesaid rod. thus allowing theposition of the reflectorto he vertically adjusted The portion of the holdcr (8 extending abovethe table 65' has a rearwardly extending flange 71 through which passesthe threaded endof a set screw 72 rotatably supported in bearings 73upon the said table, and extending throu h a slot 74 in the'sidc of the,casing. It wil be apparent that by suitably turning the set screwtlie'refiector may be transversely adjusted. A rack mounted on theplatform (it eater. is adjacent to the table 65 and is en "iged by apinion 76 at the end of a rotatab erod 77 suppoited in bearing 78 on thesaid table. The said rod extends through a slot 79. It will'be apparentthat by properlyturning the said rod the reflector may belongitudinally-adjusted.

.The electric" sup ly circuits for the lamps 17 at each endfoi .tliehousing are shown diagrammatically in h ig. 9. A transformer 80 suppliescurrent at a comparatively high voltage through the leads 81 to theleads 82, which are connected to the stationary contacts 61'with whichthe movable COI'lttlCtSMi connected to that lamp 17 which is inimmediate use-engage. The transformer '80 also furnishes currentf at acomparatiyely low voltage through tothe stationary contacts sewn emovable contacts 57 connectedto lthat mp 17 which is not in use engage.Ttisapparent that this portion of the supply circuit may be omitted.However, it is desirable that means be provided for lighting upthatla'mpl? which is not in immediate use SoJ'thatQnQE-may be properlyadjusted to beready-for such .nse when called upon. .Itisnotnecessaryjhat the lamp be illuminated to its fullest'e'xtentforthis pun, pose, and, therefore, the Voltage of the current supplied ispreferably-low. However. this is' notimperatiiief; ouble :contact switch84 may.-be;;-piioir,ided current when p '1 It will pare n ha't' tluitportion of the apparatus. shown whieh 'is described above IS suficient'for practical operation with or without-the sprmgrotating device or thestop mechanismheretofore dcscribcd. In such case wheneyer ajlamp failsor it is desired to substitute another lamp for any reason, the housi'ngniay be readily rotated manually to-bring theiother lamp into open ativerelation with the rest of-the picture projecting apparatus... However.in'the form shown anautomatie meansisprovided for effecting theoperation upon the failure of the lamp. F orthis purpose there isincluded in series with the lamp in immediate use the winding ofthesolenoid 85. The winding of another solenoidfih is connected in shuntwith. the supply circuit for this lamp 1-7. The pin 55 constitutes anarnuituic con trolled by the solenoid 86. The winding of the saidsolenoid is connected to the )uetal' casing 87 of a dashpot havingtherein a piston $9 from which extends a contact 89 nor nmlly restingupon the contact 90, which is apertured in." line with the core of thesolenoid 86 and-'carrics at its outer end a contact 91 which is in linewith the armature of the solenoid 85. The armature 92 is connected bymeans of a lead 9? to a contact M which is engaged by an extension l ofthe switch 8-} when the latter is in closed position. 'lhc winding ofthe solenoidhii is councctcd ut H6 to oneof the Imus-.3.-

' Normally the. armature H2 is hcld b thc solenoid out of cngzigcmcntwith lhc con tact 91. l pon thefailurc of thc lamp ii in immediate usethc solenoid H5 is dci ncrgizcd and the armature 9-2 fulls---intocngngcnlcnt with the contact i l. 'lhis colnplctcs thc circuit throughthe solenoid 86 which raises th in 55 out of engagement with the springliolding member 55. The springol thcu causes the rotation of the housinguntil the other pin engages with the holding menu- 55'. The other lampis thus substituted in operative rclatioirand the solenoid 55 isrecnergizcd drawing up' the armature 92 and breaking the circuit throughthe solenoid 8h. The said solenoid has been previously dcencrgized byreason ,of the pin .35 striking against the contact S9 causing thepiston Rh to rise in the dashpot T. The contact graduallyreturns intoengagement with thc contact 90. but the operation. is so timed that bythat time the circuit has been broken through the solenoid S6 and therclcnsc of the pin 55 will not be re 'icated.

Various changes and mmhhcations of the above described apparatus willreadily suggest themselves to those skilled in the art.

but these are to be considered as coming wlthin the scopeof ourinvention, which is j set forth in the following claims. cutting otf'the"hat we claim as new and desire to secure by Letters Patent of theUnited States, is:

'1. In a picture projection apparatus the combination of a plurality oielectric lam is adapted to be placed one aftcr thcother Ill operativerelation with the lens system. a plurality of universally adjustablcsupports for said lamps whereby each huup may be accurately, andindividua|| adjusted with reference to said lens system. means forlighting t lamp not at the time in use for focally adjusting the same,and mcans whereby the adjusted lamp may be substituted for'the lamp inuse at the will of the operator.'

2. In a picture projection apparatus the combination of-a p ura'lity ofelectric lamps adapted to be placcd one after the other in operativerelation with thelcns system, a plurality of universally adjustablesupports for said lamps whereby-each lamp may be accurately andindividually adjusted with reference to said lens system. means forcombination of a plurality of electric lamps adapted to be laced oneafter the other in operative relation with-'the-lens system, a )luralityof adjustable supports for said lamps whereby each lamp may beaccurately and individually adjusted with reference-to said lens system,means for lighting a lampfnot at the time in use for focallyad'ulstsigrg the same, and means whereby the a j at the will of theoperator.

49 In a picture projection apparatus, the combination of a plurality ofelectric lamps adapted to be placed one afterthe other in 0 rativerelation with the lens system, a

purality of. adjustable supports for said mps whereby each lamp may beaccurately and individually adjusted with reference to said lens system,means whereby each lamp same and means whereby an adjusted may besubstituted for the lamp in use at the will of the operator. s

5. A lamp fixture for projecting appah ratus comprising a relativelyfixed part,'a lamp support movably mounted thereon, 'a

plurality of lamps carried by said support and so positioned thereonthat either lamp maybe brought into operative position'by movement ofsaid support, means for separately adjusting said lamps relative to saidsupport, reflectors for'each of said lam 's,

and means for adjusting said reflectors in e-" pendently of said lan}psand of "said support;

6. A lamp fixture r projecting purposes comprising a table mounted forrotation, incandescent lamps carried by said table at difl'erent pointscircumferentially thereof, each of said lamps being mounted on a parthaving a radially adjustable connection with said table, and means forseparately adjusting said lamp carrying parts.

7. A lamp for projecting apparatus comprising a rotatable table.radially adjustable slides carried by said table .at diametricallyopposite points, a second slide carried by each of said first mentionedslides and adjustable transversely thereof, and incandes andiradially ofsaid table. lamp may be substituted'lfor'the lamp in-uee j 1 centelectric lamps carried by said second slides.

8. A him for projecting purposes comprising a ta le mounted forrotation, a plurality of lamps supportedby said table to be brought byrotation thereof to the same operative position, and means forseparately adjusting said lamps both circumferentially 9. A lamp forprojecting-apparatus com prising a table mounted for 'rotation, a'plurality of lamps supported b said table to be hroughtby rotationthereo' tethe same operative position, means for separately adjustingsaid lamps both circumferentially and radially of said table, andseparate reflectors for each of said lamps, said reflectors beingadjustably su ported independently of their respective amps. may befocally adjusted prior to using the amp 10. A lamp for projectiapparatus com prising'a rotatably moun p table, a lurality of lampssupported by the table or adjustment by rotation of th q'table to thesame pperative position, said table comprising a ower lam -supporting,an upper part rigidly coiinected to said lamp-supportm part andextending above said lam s, an separateereflwtors for each of sai lampssuspended from said upper part.

11. A lamp for'projecting apparatus comprising a rotatable table,' aplurality of lamps supported by the table for adjustment by rotation ofthe table to the same opera tive position, said table comprising a lowerlamp-supporting part, an upper part rigidly conn'cwted to saidlamp-supporting part and extending above said lamps, separate reflectorsfor each of said lamps suspended from". said upper part, adjustableconnections between said lamps and saidtable, and separate adjustableconnections between said re- 1 flectors and-Said table.

In witness whereof wehave hereunto set our hands'this 17th day ofJanuary, 1916-.

' SAMUEL EVERETCl DOANE. ROBERT P. BURROWS.

ABCHIBALD F. SINCLAIR.

